Our Approach to Water Resources
Water resources are one of the valuable resources that support our life, living and business activities. But due to the impact of climate change, population growth, and demand growth deriving from economic development, the risk of water resources is predicted to grow in the future.
Water resources are indispensable in the production process at Subaru, and their shortage has the potential of affecting our business activities, we started conducting water risk assessment at major production bases, and has confirmed that our risk is low.
In addition, we appropriately ensure, use, and discharge water in our business activities.
Subaru has established its own voluntary management standards of water quality to be 20% higher than legal standards for water quality. Voluntary inspections and third-party inspections are also conducted regularly. In the water quality test results in FYE2018, there was one case that exceeded the voluntary management standards, and we immediately took measures.
The total amount of water use and water used per unit of production are managed by totaling the amount of water for each facilities and reporting and verifying these figures at the biannual meeting.
Water Consumption (Total Amount of Water Use)
Breakdown of Water Consumption by Water Source at Major Production Bases
|Region||Industrial Water||Tap Water||Source of Water Intake|
|Japan||3,130||295||Tone River, Watarase River|
|North America||0||825||Mississippi River|
Implementation of Water Risk Assessment
Subaru has a third-party expert implement a water risk assessment* related to water intake and discharge in order to use water resources sustainably. In FYE2017, it was conducted at Gunma Plant and Subaru of Indiana Automotive, Inc. (SIA), which are our bases for automobile manufacturing. In FYE2018, it was also conducted at Utsunomiya Plant, which is our base for aerospace manufacturing.
The assessment estimated water supply and demand in the river basins where each base is located, and evaluated the possibility of water disaster and the impact on public health, ecosystem, etc. at five levels. We use these to set priorities and perform measures.
|Assessment Target||Water supply and demand||Water disaster||Vulnerability to water pollution||Comprehensive evaluation|
|Current||Future trend||Public health||Ecosystem|
Gunma Plant and Subaru of Indiana Automotive, Inc.
These sites, which are our bases for automobile manufacturing, currently have a moderate water supply and demand risk and it is expected that the current risk level will be maintained for the mid- to long-term even when taking climate change into consideration. No biodiversity protection areas have been confirmed downstream and a low vulnerability to water pollution has been confirmed.
The Utsunomiya Plant, which is our base for aerospace manufacturing, currently has a moderate water supply and demand risk. However, it is predicted that in the future river flow rate increases while the water demand decreases, and thus the water supply and demand risk is expected to improve in the future. Since the site is not in a flood inundation area and a sediment disaster area, a low water disaster risk was confirmed. No biodiversity protection areas and rare aquatic life are confirmed 10 km downstream of the site, and a low ecosystem risk was confirmed.
Going forward, we will review our use and conservation of water resources to meet the local demand based on this assessment.
An Initiative to Reuse Water at A Production Base
Subaru introduced a surface treatment facility incorporating an ion exchange/recycled water production system at Utsunomiya Plant, and reprocess wastewater to utilize it as recycled water (pure water). In FYE2018, 42,000 m3 (29%) of the total 146,000 m3 of water used in the surface treatment facility was treated and used as recycled water. Recycled water is used at the plant as washing water in the surface treatment facility.